Automatic optical focusing device and optical reader...

Details Automatic optical focusing device and optical reader... Automatic optical focusing device and optical reader...

G - Physics

02

F

345/57, 352/32.2

G02F 1/00 (2006.01) G02B 26/08 (2006.01) G11B 7/00 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1082342

AN AUTOMATIC OPTICAL FOCUSING DEVICE AND AN OPTICAL READER COMPRISING THIS DEVICE Abstract of the Disclosure The invention relates to the focusing of an optical system by variation of the radius of curvature of a reflec- ting element, comprising two prepolarized thin plates of piezoelectric material which are joined together and each of which carries an electrode, the outer surface of one of the two thin plates being made reflective. An electrical signal characteristic of the correction to be made is applied between the two electrodes and produces a variation in the radius of curvature of the thin plates. The reflecting element is used in an optical system of the Cassegrin type or as a reflecting mirror.

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